﻿using System;
using System.Windows.Data;
using System.Windows.Markup;
namespace TciNewsReader_2014_04.Converters
{
    [ValueConversion(typeof(bool), typeof(bool))]
    public class InverseBooleanConverter : MarkupExtension, IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (targetType != typeof(bool))
                throw new InvalidOperationException("The target must be a boolean");
            return !(bool)value;
        }
        public object ConvertBack(object value, Type targetType, object parameter,
            System.Globalization.CultureInfo culture)
        {
            return null;
        }
        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return this;
        }
    }
}
